gravesite of obama his great-grandfather, the person for whom the obama name derived. just kind of amazing stuff all day. >> host: you spend a lot of time in interviews talking about the tribal situation in kenya. >> guest: it explains a lot about barack obama senior. this book is more than just a biography of barack obama who became president of the united states. it's about the places they created him come the people that created and starred in two generations back and moving through to obama himself. and his father in some ways represented the promise and the frustrations of africa and of kenya and on a more personal level of the sudden brilliance in flawless. and some of that have to do with tribalism. the luo are the second largest tribe in kenya in the colonial period when the british dominated kenya really created the sort of tribalism putting all the different tribes into the reserves in different parts of the country. and so when they got independence in god power, there was this unfortunate sort of conflict for power in the luo were basically, ever since 1963